Process of making corrugated sheets



Aug. 18, 1925. 1,550,648

R. P. PERRY.

rnocsss or MAKING CORRUGATED snsn'rs Filed Dec. 16, 1920 j INIVENTOR ATTORNEY come incorporated in the felted together.

description taken Patented Aug."18,1925..

UNITED "STATES PATENT OFFICE.

BAY r. PERRY, or urrnn PROCESS OB" MAKING CORRUGATED SHEETS.

Application filed December 10, 1920. semi'm. 431,058.

To all whom it may concern; Be it known that 1, RAY P. PERRY, a citizen of the United States, residing at 22 Parkside, Up r Montclair, in the county of Essex and gtate of New Jersey, have invented certain new and useful Improvements in Processes of Making Corrugated Sheets, of which the following isa specification.

One of the objects of this invention is'to produce a corrugatedshe'et or board which shall be free from weak spots and which shall be substantially homogeneous or uni form throughout its entire extent. Another object of this invention is to produce a corrugated sheet containing felted fibrous material in which no substantial portion of the fibers is torn apart after having once been Other objects and advantages of this invention will be obvious as the description proceeds.

In practicing this invention a thin sheet is formed, containing fibrous and waterproofing materia on an ordinary pap'ermaking machine, byintroducing particles of comminuted waterproofing material into the paper pulp and permitting the same to besheet as the same isformed on the perforated cylinder of the paper-making machine. This sheet, containing the fibrous and waterproofing material, while still wet is laid or wrapped upon a corrugated surface so as to form the corrugations without tearing The folding or wrapping of the successive layers while still wet causes the fibers on the surfaces to mat or felt together, thus producing an initial joining of the same into an integral body. The product thus formed may be then be dried and pressed under great pressure and at high temperature-between the corrugated plates of a press so as to melt or fuse the waterproofing material and cause the product to be firmly united into a stiff, rigid The invention wi I be understood from the in connection with the accompa'nying drawings, in which I F1 1 is a'side view of a machine for making t e sheet. v

Fig. 2 is a; side view of'a' different sort of corrugated mandrel'for use in the process. Fig. 3 is a side view of a pre$ in which the corrugated sheet may be pressed Inthe drawings reference character 1 inthe fibers apart dicates the vat of an ordinary'paper-making machine, in which the cylinder 2 revolves, and u on which the sheet 3 is formed and picke up by the wet blanket 4 that passes over rolls 5 and 6. The material introduced into the vat 1 comprises fibrous material, such as paper-making stock, and comminuted particles of waterproofing material out of which the sheet 3 is formed. The

sheet 3 may be passed between squeeze-rolls 6 and v7 to press out of the same a part of the water, after which the sheet may be made to pass around a mandrel 8 provided with a series of longitudinal ribs or corrugations 9. The sheet 3 may be made to'as- 7t sun e more nearly the shape of the corrugations 9 by means of a correspondingly corrugated press-roll 10, which slides in guideways 11. The corrugations'l2 of the press-roll sheet 3 so that the same assume the shape of the outside of the mandrel 8, as indicated in Fig. 1. The wet state of the sheet 3 enables the same to be bent into the proper shape and also causes the fibers to mat or felt, as above mentioned. When. suflicient turns have been made to produce-a cormgated article of the proper thickness, the iheet 3 is severed and the roll is slit along a o obvious that themandrel 8 canbe' made of suificient diameter so that the internal and external diameters of the corrugated roll do not differ from each other sufliciently to cause serious distortion of the fibers when 90 drel with longitudinal corrugations, as indicated in Fig. 1, the wound upon a mandrel Fig. 2, which has circumferential corrugations 14, thus causing the corrugations of the sheet 3 to be parallel with the fibers of the sheet instead of being across the fibers, as would be the case with the mandrel '8, as shown in Fig. 1. A correspondingly pressroll'may be used with the roll 13, if neces sary, to insure the proper conformation of the corrugations. The rollwound upon the mandrel 13 may, tions have been made to form the proper thickness, be slit longitudinally and spread out'flat.

Instead of wrapping or winding the sheet 3 upon a corruga same may be wrapped or 10 press the convolutions of the 'tudinal line and spread out flat. Itis 13, as indicated in when sufiicient convolumandrel,-the same may 11 be folded back and forth upon itself upon a flat plate having on its face the proper convolutions, and the sheet may be caused to fit the convolutions by runnmg a roperly corrugated roll over the surface of t e same.

The flat sheets may be and preferably are further dried and laced between the members 15 and 16 of t e hydraulic ress shown in Fig. 3. The member 15 may provided with a hollow chamber 17 and the member 16 may be provided with a hollow chamber 18, into which chambers heating or cooling fluids may be introduced. When the flat sheet above described is introduced between the members 15 and 16 of the press, the same may be heated by passing heating fluid into the chambers 17 and 18 sufiiciently to melt the waterproofing material, and pressure may be applied, thus causin an intimate union of the layers into a su stantially homogeneous and integral body. While the pressure is still a plied the heating fluid may be turned 01? and cooling fluid run into the chambers 17 and 18, thereby causing the waterproofing material to set, time producing a hard and rigid corrugated product that will rmanently retain its sha c.

It has een found in practicing t is invention that articles suitable for certain purposes'can be made as above described by maklng sheets containing itch as the waterproofing material, whic pitch may have a melting point from about 250 F. to 300 F. The pitch may be about 50% to 90% of the total weight of the finished product.

I claim:

1. The process which comprises forming a sheet containing fibrous material and comminuted bituminous material, and superposing a plurality of layers of said sheet on each other, one at a time while wet upon a cornu. ated surface.

2. The process which comprises forming a sheet containing fibrous material and comminuted bituminous material, superposing a plurality of layers of said sheet on each other, one at a time while wet u n a cor-' rugated surface, and dryi an pressing the same to form a corrugate product.

3. The process which comprises forming a sheet containing fibrous material and comminuted bituminous material, supe csing a plurality of layers of said sheet w 'le wet upon a corrugated surface, and dryi and hot pressing the same to form a rigi corrugated product.

4. The process which comprises forming a sheet containing fibrous material and comminuted bituminous material, superposing a plurality of layers of said sheet while wet upon a corru ated surface, drying the layers, melting the ituminous material, and pressing the product in la: hot press having corrugated faces.

5. The process which comprises forming upon a apermaking machine a sheet containing brous material and pitch, and superposmg a plurality of layers of said sheet on each other, one at a time while wet upon a corrugated surface.

6. The process which comprises forming a sheet containing fibrous material and comminuted bituminous material, and superposing a plurality of layers of said sheet upon a corrugated surface and pressing each layer into corrugations before the next one is apphed.

In testimony whereof I afiix my signature.

RAY P. PERRY. 

